<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>
</head>

<body>
    <div id="app">{{message}}</div>
    <script>
        new Vue({
            el: '#app',
            data: {
                message: 'Hello Vue!'
            },
            // template: '<h1>{{ message }}</h1>'
        });
    </script>
</body>

</html>